Magazine and feed means for fastener driving machines



Feb. 14. 1956 c. H. TRUE, JR.. El AL 2,734,192

MAGAZINE AND FEED MEANS FOR FASTENER DRIVING MACHINES Filed Sept. 2.1950 3 Sheets-Sheet 1 Charles H. True J? Harold W. King fa. 7MM E 221 5F 14. 1956 c. H. TRUE, JR.. ET AL 2,734,192

MAGAZINE AND FEED MEANS FOR FASTENER DRIVING MACHINES Filed Sept. 2.1950 3 Sheets-Sheet 2 so i WWW lx i

Harold W. King Feb. 14, 1956 c. H. TRUE, JR., ET AL 2,734,192

MAGAZINE AND FEED MEANS FOR FASTENER DRIVING MACHINES Filed Sept.- 2.1950 3 Sheets-Sheet 5 IYVZ/EZTZAUTE Char/es 1% 771m J2." Harold W. KingUnited States Patent MAGAZINE AND FEED MEANS FOR FASTENER DRIVINGMACHINES Charles H. True, Jr., Kenilworth, and Harold W. King, ArlingtonHeights, Ill., assig'nors to fspotnails, inc, Evanston, 111., acorporation of Illinois Application September 2, 1950, Serial No.183,012 11 Claims. 01. i-im This invention relates to improvements inmachines for driving pointed fastening elements into members to besecured together and more particularly concerns a novel machine of theportable type especially adapted for driving sash pins in themanufacture of window sash or the like. 7

An important object of the present invention is to provide an improvedfastener driving machine having novel fasteners supporting and drivingstructure.

Another object of the invention is to provide a novel assembly at thedriving end of a fastener setting machine especially constructed andarranged to withstand the repetition of driving shocks to which amachine of this kindis subjected in service.

A further object of theinvention is to provide improved driving plungerand blade means in a machine for driving and setting sash pins or thelike.

Still another object of the invention is to provide an improved feedmechanism for driving machines wherein a series of drivable fasteningelements is fed successively to a driving plunger.

Yet another object of the invention is to provide novel feed magazinestructure for sash pins.

Other objects, features and advantages of the present invention will bereadily apparent from the following detailed description of a preferredembodiment thereof taken in conjunction with the accompanying drawingsin which:

Figure 1 is a side elevational view of a fastener driving machineembodying the features of the present invention; Figure 2 is a rearelevational view of the machine;

Figure 3, is a vertical sectional detail view through the machine takensubstantially on the line III--III of Figure 1;

Figure 4 is an enlarged longitudinal vertical sectional view through themachine taken substantially on the line IV--1V of Figure 2;

Figure 5 is a bottom elevational view of the front portion of themachine taken substantially as indicated by the line VV in Figure 4;

Figure 6 is a fragmentary top plan view of the rear portion of themachine substantially as indicated by the line VI-VI of Figure 1;

Figure 7 is a horizontal fragmentary sectional detail view takensubstantially on the line VII-VII of Figure 1;

Figure 8 is an enlarged vertical sectional detail view takensubstantially on the line VIII--VIII of Figure 4;

Figure 9 is an enlarged fragmentary horizontal sectional detail viewtaken substantially on the line IX-IX of Figure 4; and

Figure 10 is an enlarged fragmentary horizontal sectional detail viewtaken substantially on line X-Xsof Figure 4.

Having reference to Figures 1 and 4, a machine according to the presentinvention comprises a body provided with a handle 17 by which it can begrasped and carried to and held in position upon work into which afastening element such as a sash pin 18 carried within 2,734,192Patented Feb. 14, 1956 a magazine 19 in the body is to be driven by adriving blade 20 by actuation of a plunger 21.

In an economical form, the body 15 is made from complementary sidemembers 22 and 23 which may be machined from individual metal plates orcastings, "but are preferably made from an appropriate moldable materialby which the desired configurations and cavities are economically formedon and in the side members or plates. As shown, the side member 22provides the left side or face of the. machine and the side member 23provides the right side or face of the machine '(Figs. 1, 2 and 4).Appropriate separable fastening devices such as bolts or screws 24 areemployed to secure the two half portions or plates of the body incomplementary working assembly to provide the body unit 15. The handle17 is integral in one piece with the upper portion of the body anddefines with the upper portion of the body 23 a hand hole 25. v

Each of the sash pins 18 comprises an elongated straight body, generallyround or rounded in cross section, having a chisel point at one end anda blunt head at the opposite end. Adjacent to the head end of the sashpin body is provided a transverse groove 27 (Figs. 3 and 8) for riding asupporting and guide rail 28 within the magazine 19 of the machine. Forconvenience in hatidling, a substantial number of the sash pins 18 isassociated in a flattened stick by adhering the sash pins inedgc-to-edge relation by means of a suitable solidifiable adhesive. Apartial stick of sash pins 18 is shown in Fig. 4. It will be understoodthat the sticks of sash pins may be made as long as desired and thelength of the magazine 19 and therefore of the supporting rail 28 arepreferably such as to accommodate one fairly long stick or a pluralityof shorter sticks of sash pins.

The magazine 19 is preferably formed as an elongated horizontal vchannelor passage through the lower portion of the body 15 of the machine andmay conveniently comprise opposing complementary channel recesses in therespective interfaces of the side members 22 and 23 the body. The heightofv the magazine channel is preferably somewhat greater than the lengthof the sash pins 18 and the width of the, magazine is slightly greaterthan the thickness of the sash 'pins, thereby freely accommodating thesash pins but serving to retain and guide the sash pins in a verticalposition for feeding to the driving end of the machine. V I

In a convenient form, the rail 28 may comprise an inverted generallyL-shaped bar having the rail portion 28 and a vertical leg 29 which isreceived in a horizontal channel 30 recessed into one wall of themagazine 19, as for example in the wall provided by the side plate 22,so as to clear the magazine proper, and may be secured therein as bymeans of screws 31. The rail 28 is especially advantageous in supportingthe sash pin-s 18 with the points thereof free from frictional contactwith the floor of the magazine 19. Furthermore, the rail 28 preventscocking and jamming of any individual sash pin within the magazine or atthe driving station within the machine where such an individual pin mayhave escaped from its captive relation within a stick or may comprisethe trailin endmost and thus remaining sash pin of a stick, theremainder of which may have been used up.

Loading of the machine with the sash pins 18 is very easily accomplishedby inserting the sash pins into the open rear end of the magazine 19,with the guide rail 28 engaging within the aligned notches 27in the sashpin.

In order to retain the sash pins 18 against escape from the open rearend of the magazine 19 and to urge the sash pins positively toward thedriving station at the forward end of the machine, retaining andpositive feed means are provided comprisinga pusher 32 preferably in theform of a blade or plate of approximately the width and height of thesash pins 18 at its forward edge and appropriately dimensioned to fitfreely for reciprocal movement within the magazine 19 (Figs. 2 and 4).After a supply of the sash pins 18 has been fed into the magazine 19,the pusher 32 is inserted into the rear of the magazine to drive againstthe rear of the series of sash pins.

'Means are provided for exerting a forwardly biasing force against thepusher 32. Herein such means comprise a coiled compression spring 33mounted about a guide rod 34 and bearing against an abutment Washer 35abutting the rear end of a guide sleeve 37 provided on an upwardextension 38 on the pusher 32. By reference, the upward extension 33 issubstantially shorter than the overall length of the pusher 32 andprojects upwardly from the rearmost portion of the upper margin of thepusher 32. As best seen in Fig. 2, the extension portion 38 of thepusher is configurated to extend freely about the edge of the guide baror rail 28 and then extends laterally and upwardly to clear through aslot 39 provided in the roof of the magazine 19 and aifording alongitudinal passage into an upper longitudinally extending pusherspring chamber as parallel to the pin magazine. The chamber 40 ispreferably formed from complementary channels of semi-circularcross-section in the respective side plates 22 and 23 of the machinebody.

The construction and relationship of the spring 33, the guide rod 34,and the pusher sleeve 37 are such that constant spring pressure bias ismaintained upon the pusher from the position of maximum magazine loadwherein the pusher is located at the extreme rear of the machine untilthe last pin is driven from the magazine into the driving station of themachine at the extreme front of the pin magazine. To this end, the guiderod 34 is of a length to extend the substantially full length of thespring chamber 40 and at least to a position at the forward end of thespring chamber wherein engagement of the forward end of the guide sleeve37 of the pusher with a stop collar 41 on the forward end portion of therod 34 and coincides with the most extreme forward position that must beassumed by the forward edge of the pusher 32 in driving the last of thesash pins 13 into position for driving by the driving blade 24 Thesleeve 37 is freely slidable longitudinally on the rod 34 under theinfluence of the compression spring 33. When the magazine 19 is to beloaded, the pusher 32 is withdrawn from the magazine by withdrawing therod 34 rearwardly. After a load of sash pins has been inserted into themagazine 19, the pusher 32 is inserted into the magazine in drivingrelation against the rear extremity of the series of pins and the rod 34is projected forwardly into the spring chamber 40 to the maximum extentof the rod and in so doing the spring 41 is placed under compression,the rear end of the spring 33 being anchored upon the rear end portionof the rod 34.

In order to increase the elasticity of the springs 33 by an increase inits length without objectionable projection thereof rearwardly from thebody of the machine while in service, the guide rod 34 is return bent toprovide a generally U-shaped loop 42 thereon and a forwardly directedleg 43 extending preferably parallel to the body length of the rod 34,with the spring 33 of a length to encompassnot only the body length ofthe rod rearwardly of the slidable pusher guide sleeve 37 but also theloop portion 42 and the return leg portion 43 of the rod. The return legportion 43 preferably extends to approximately half the length of thebody portion or main leg of the rod.

For retaining the rod 34 in the loaded, service position thereof againstthe thrust of the compression spring 33, releasable anchoring means areprovided which comprise a rearwardly extending lug 44 on the outer orforward extremity of the rod leg 43 which is engageable in a forwardlyopening retaining socket 45 formed at the rear base of the handle 17 andwith its mouth at the rear extremity of the hand hole opening (Figs. 4and 7). By

preference the socket is formed by complementary opposing recesses orblind end channels formed in the opposing interfaces of the two plates22 and 23 of the machine body. The retaining or anchoring lug 44 isconveniently formed by turning rearwardly the outer extremity of thespring rod and disposing the lug in sufiiciently spaced relation to theadjacent leg 43 of the rod to accommodate the thickness of the platemember 23, the outer extremity portion of the rod being for this purposeprovided with a head portion 47 by which the lug 44 is joined to theremainder of the outer leg 43 of the rod.

For convenience in manipulation, the head portion 43 is formed atimmediate juncture with the rod leg 43 with a laterally projectinghandle portion or bend 43 which projects laterally sufficiently beyondthe machine side 23 to enable convenient grasping thereof for releasingthe lug 44 from the socket 45 by forward thrust on the handle inopposition to the spring 33 to a position substantially as indicated indash outline in Fig. 6. Thereupon the lug i4 and the arm 43 of the rodcan be swung out clear of the adjacent side of the machine body and therod pulled rearwardly out of its chamber 40 to withdraw the spring andthe pusher 32. Upon reassembly, after the rod 34 and pusher 32 have beenreinserted into the machine and the rod 34 pushed as far as permittedinto the chamber 46, the lug 44 is reengaged within the retaining socket45 by reversal of the process described for removal thereof and thehandle 48 released so that the thrust of the spring 33 draws the lug 44-into the socket 45. It will be observed that ample space is afforded atthe forward end of the chamber 41) to clear the tip portion of the rod34 during the insertion or removal of the rod 34 as described.

in order to avoid interference with the spring 33 by the palm of theuser of the machine while grasping the rearwardly slanting handle 17 inservice, suitable guard fins are provided on the machine body 15. Tothis end, a spaced pair of longitudinally extending laterally projectingguard fins or ribs 49 is provided at the side of the machine body at thebase portion of the handle 17 on the side plate 23 along side of whichthe forwardly projecting outer arm 53 of the spring guide rod extends,the protecting ribs 49 flanking a longitduinal groove 59 Within whichthe rod arm 43 and the adjacent terminal portion of the spring 33 arereceived (see Figs. 1, 2, 6 and '7). Additional protection is providedby a vertical fin 51 which projects upwardly and rearwardly from themachine body rearwardly from the handle 17, with the upper edge ortionof the fin projecting above the service position of the guide arm 5-3and the associated portion of the spring 33. By preference the fin 51 isformed on the side plate 22. Through this arrangement, when the machineis manipulated by means of the handle 17, the heel of the palm portionof the users hand will be guarded against applying damaging oroperationinterfering pressure against the spring 33.

An especially compact, rugged, economical and efficient construction isprovided for the forward, pin driving portion of the machine. Animportant feature of this construction comprises a strong, one piecereinforcing and guide nose portion or member 52 which is constructed andassembled in novel fashion with the work engaging forward phi settingportion of the machine.

One of the important functions of the nose member 52 is to retain theforward portions of the side plates 22 and 23 of the machine againstspreading under the force dissipating impact incident to the stopping ofdriving blows of the plunger 21 and the driving blade 20 at the end of adriving stroke. For this purpose, the nose member 52 is formed ofgenerally U-shape cross-section (Fig. 5) in horizontal or plan section,including a front vertical wall 53 and similar opposite side walls 54.The body side plates 22 and 23 are preferably thickened as indicated at55 for reinforcement purposes at the front of the machine and the nosemember 52 snugly engage:

in interconnected manner with the thickened plate portions, being forthis purpose arranged to be assembled by sliding the same into positionby relative movement from the bottom of the machine toward the upperportion of the machine.

An interlocking interengagement of the nose portion 52 with thethickened side plate portions 55 is effected by providing the rearmargins of the side walls 54 of the nose member with bpposing inwardlyextending interlock flanges or ribs 57 which engage in interlockcomplementary grooves 58 in the forward plate portions 55. It will beobserved that in this manner the forward end portions of the body plates22 and 23 are held very effectively against spreading and the nosemember 52 is held effectively against displacement forwardly from themachine.

Unintentional downward displacement of the nose member 52 is preventedby a securing pin 59 which extends through a pair of upwardly extendingspaced parallel attachment ears 60 on the upper forward portion of theside walls 54 of 'the nose member (Figs. 1 and 3). The pin 59 isdetachably held against displacement by means of an integral head 61 atone end and a detachable snap on lock collar 62 adjacent its other endand the shank of the pin extends through the forward extrem'ity portionsof the side plates 22 and 23 forwardly of the driving blade 20 (Fig. 4

Since the rigid and rugged nose member 52 is especially adapted towithstand the impact incident to the terminus of pin driving strokes ofthe'plunger 21, means are provided for assuring transmission theretofrom the body of the machine of the residual impact force of the drivingblows upon the plunger. For this purpose the upper portion of the nosemember 52 is provided with a substantial upwardly facing shoulderformation 63 (Figs. 3 and 4) opposing overlying complementary portionsof the body side plates of the machine, supplemented by an insetrelationship of the attachment ears 60 into the sides of the thickenedportions 55 of the side plate.

Another important function of the nose member 52 is to provide drivingguide-way for the sash pins 18, and the driving blade 20. For thispurpose, the inner face of the front wall 53 of the nose member has avertical pin and driving blade guiding" channel or way 64 (Figs. 4, 5and The guide channel or groove 64 is disposed vertically in front ofand in centered relation to the forward end of the pin magazine 19 toreceive the sash pins 18 successively as fed thereinto from the magazine19 by the pusher 3 2. By preference the width of the driving groove 64is slightly greater than the width or thickness of the pins 18 toaccommodate a somewhat wider dimension in the driving blade 20 whichshould be not excessively wider than the thickness of the pins so thatthe driving tip of the blade will not make an excessively large holewhen countersinking the sash pins but which must be of sufiicientcross-section to avoid buckling in driving.

While the forward side of the driving blade 20 is supported within thedriving groove 64; the rear side of the driving blade should alsoreceive firm support andfor this purpose a backup plate 65 (Fig. 3) isprovided which isdimension'ed to fit immediately inside of the'frontwall 53 of the nose member and between such front wall and the adjacentend portions of the side plates 22 and 23 of the machine body. Forpassage of the sash pins 18 through the plate 65 itisprovided with adoorway slot 67 disposed vertically in alignment for free passage of thepins therethrough into the driving guideway 64. The width of the doorwayaperture or slot 67 is slightly less than the width of the driving blade20 so that throughout its range of movement, the driving blade is backedup between the plate 65 and the forward wall defining the drivingguideway 64. As will be noted in Figures 3 and 4, the upper portions ofthe nose member 52 and the back-up plate 65 extend a substantialdistance above 6 the doorway aperture 67 so that in the fully retractedposition of the blade 20 above the sash pin 18 next to be driven, asubstantial portion of the tip of the blade is thoroughly backed upagainst buckling and is guided for accurate engagement with the head ofthe pin.

In order to avoid turning of the sash pins 18 out of the verticaldriving alignment with the driving blade'20 in the driving guideway 64,the front to rear dimension of the guideway is in general so related tothe width of the sash pins that a snug relationship would normally existand the snugness is relieved by respective opposing relief and turnpreventing vertical narrow guide grooves 68 within respectively theforward wall defining the guideway 64 and the opposing lower portion ofthe surface of the plate 65 below the doorway of aperture 67 (Figs. 3,4, and 5). The rounded opposite sides of the successive sash pins 18 arereceived in the opposing guide grooves 68 and thus held against tiltingor turning out of the driving path.

ln a preferred construction, the driving blade 20 is formed as aseparable thin hardened steel plate which is assembled with the forwardface of the plunger 21 preferably formed as a square elongated memberhaving an impact knob or head 69 at its upper end. As best seen in Figs.3, 4 and 9, the driving blade 20 is preferably formed with asubstantially elongated narrow and thin lower driving blade portionhaving an upper generally cruciform body portion 70 which need be of nogreater thickness than the driving portion of the blade but which is ofsubstantially greater width than the driving portion of the blade. Theblade body 70 is set into a complementary cruciform shaped recess 71 inthe forward face of the plunger 21. Thereby not only is the drivingblade 20 held against longitudinal displacement with respect to theplunger 21 but it is also held against lateral displacement and moveswith the plunger 21 for driving and retraction movements. The cruciformarrangement with the upper end of the blade body 70 rounded as seen inFig. 3 is advantageous in presenting maximum edge surface of the head ofthe blade member to opposing complementary surfaces of the plunger 21within the recess 71 to distribute driving force from the plunger 21uniformly and effectively against the blade.

The driving plunger 21 is guided for vertical reciprocation in anappropriate square guideway 72 providedin the thickened portions 55 ofthe body plates 22 and 23 and formed by complementary opposing verticalchannels or grooves in the body plates cooperating to provide theguideway. An appropriate bearing liner 73 is provided within theguideway 72 for reducing friction and wear between the plunger and thewalls defining the guideway. By preference the bearing'liner 73comprises nylon since this plastic has the desirable property ofproviding substantially wear-free bearing surface requiring nolubrication. As will be evident from Figures 3, 4 and 9 the front Wallof the guideway 72 cooperates with the front face of the plunger 21 tomaintain the cruciform head portion 70 of the driving blade againstescape from the recess 71.

Means are provided for automatically retracting the plunger 21 andthereby the driving blade 20, in the present instance comprising areturn spring 74 preferably in the form of a coil compression springwhich is disposed within a vertical downwardly opening elongated socket75 within the plunger. The lower end portion of the spring 74 isdisposed within a guide tube 77 extending slid-ably into the springsocket 75 of the plunger and having a lower blind end portion 78 restingupon a platform 79 provided therefor by a rearwardly bent upper marginalportion of the back-up plate 65 underlying the lower end of the. plungerguideway 72. Fixed retention of the base end portion 78 of the springtube is effected by the interlock ing of a downwardly projecting tip orboss 80 thereon within an aperture 81 provided for this purpose in theflange 79 (Figs. 4 and 10'). The reaction of the spring.

74 under compression-maintains "the tube 77 seated on.

the flange 79 and also functions to normally urge the plunger-upwardlyinto retracted position.

Besides serving as a guide for protecting the lower portion of thespring 74 from catching on the lower end of the plunger 21, the tube '77also serves as a lubricant chamber for lubricating the spring and thusavoiding frictional operating noises thereof in service. Additionally,by being closely spaced with respect to the driving blade 20, the tube77 serves as a buckling resistance backing for the driving blade 28should there be a tendency toward flexing of the blade in response to aresistance condition encountered in service or an oversharp or suddenimpact against the plunger. The front of the upper portion of the blade24 is, of course, supported against buckling by the bearing 73 backed upby the forward wall defining the plunger guideway '72.

Downward movement of the plunger 21 is limited by engagement of theunderside of the plunger head 59 against an upwardly facing abutmentshoulder 32 provided at the top of the thickened body plate portions 55.in this downward limit position the driving tip of the blade 21 projectsinto pin-counter-sinking relation below the lower end of the pin,driving guideway d t. immediately upon release of the driving forceagainst the plunger, the return spring 74 snaps the plunger 21 and theblade 20 into retracted position.

Limit upon retraction is afforded by a stop block 83 iounted within anappropriate cavity 84 (Figs. 4 and 9) provided in the body of themachine rearwardly of and opening into and through the rear wall of theplunger guideway 72 and the bearing liner 73. The forward end portion ofthe stop block 33 operatively engages in a rearwardly openin verticalgroove 35 in the rear surface of the plunger 21. At its lower end thegroove 85 has a stop shoulder 87 which engages against the adjacentopposing portion of the block 83 in the fully retracted position of theplunger and stops the plunger at a height wherein the lower tip of thedriving blade 29 clears the head of the next succeeding sash pin is fedinto the driving guideway 64. As evident from Figures 3 and 4, at thelimit of upward or driving blade retraction movement of the drivingplunger 21 the cruciform upper or head portion 7% of the driving bladeremains within the guideway 72 wherein the front wall defining thepassageway and more particularly the front portion of the liner '73continues to maintain the head portion 74 within the recess 71.

In order to enable removal of the driving plunger and blade assemblywithout requiring separation of body plates 22 and 23, the stop block 83is so related to the plunger that the stop block can be easily retractedfrom its cooperative relation to the plunger into the recess or chamber84 clear of the plunger guideway. For this purpose the stop blockchamber is of suflicient depth to receive the stop block fully inretracted position and the stop block is formed of sufficient weight andis loosely slidably received within the stop block chamber so that bytipping the machine on end with the forward portion up, the stop blockwill drop by gravity into the chamber 84, while by moving the machineinto reverse position wherein the forward end thereof is down, the blockcan be moved by gravity into the cooperative engagement within thegroove 85 in the plunger.

To retain the stop block 83 against unintentional displacement fromstopping relation to the plunger, a removable retaining pin 83 isprovided (Figs. 4 and 9) which extends through a bore 39 transversely inthe thickened portions 55 of the body plates of the machine rearwardlyof the plunger guideway 72 and with which a transverse bore 90 in thestop block 83 is adapted to register when the forward end portion of thestop block is in its operative plunger-stopping relation within thegroove 85 of the plunger 21. At one end the pin 88 has a head 91 and atits other end portion the pin has an annular groove 92 receptive of asnap on lock collar 93. Thus, while the stop block 83 effectivelyretains the driving plunger 21 against over-retraction, in the servicecondition of the machine, displacement of the stop block can be easilyeffected for release of the plunger by removal of the retaining pin 88and rearward shifting of the block when it is desired to do so.Reassembly can then be easily effected by returning the plunger into itsguideway, depressing the same until registration of the groove iseffected with the stop block chamber 84, and the machine held with theforward end portion downwardly so that the stop block 83 will drop intooperative position, whereupon the retaining pin 88 is returned throughthe registering bores 89 and 90 in the machine body and in the block,respectively, and the operative relationship is reestablished.

It will be understood that modifications and variations may be effectedwithout departing from the scope of the novel concepts of the presentinvention.

We claim as our invention:

1. In combination in a sash pin driving machine, a body structure, saidbody structure having an elongated sash pin magazine therein, a guiderail of angular cross section having a portion projecting laterally intoan upper section of the magazine for engagement within aligned guidegrooves in a series of sash pins in the magazine, a vertical dependingleg on said rail member attached to one Wall defining said magazinechamber and offset into positive clearance relation to the path ofmovement of the sash pins depending from the rail, and means for pushingthe sash pins along said rail toward one end of the magazine chamber.

2. In combination in a machine of the character described, meansdefining a body structure, said body structure having a magazine chamberin the lower portion thereof for receiving a load of fastening elementsto be driven, a pusher operable reciprocably in said magazine chamberfor driving the fastening elements toward a driving means, said bodystructure having an auxiliary chamber above said magazine chamber, saidpusher having a portion thereof projecting from the upper part of thepusher into said auxiliary chamber, a rod extending into said auxiliarychamber and with which said portion of the pusher is slidably engaged,said rod having a portion thereof extending rearwardly from saidauxiliary chamber and forwardly along said body structure, a coiledcompression spring disposed about said rod including said forwardlyextending portion, and an interlock element on said forwardly extendingportion of the rod, said body structure having a socket therein forinterlocking engagement of said interlock element therein for retainingsaid rod in operative position.

3. In combination in a machine of the character described, a bodystructure having an elongated fastening element magazine in the lowerportion thereof opening from the rear of the body and having drivingguide means at the forward end thereof, the upper portion of the bodyhaving a handle thereon defined by a hand hole, a pusher for driving thefastening elements forwardly in the magazine chamber, and means forbiasing the pusher including a rod having a portion in slidableengagement with said pusher and extending rearwardly from the body andhaving a biasing coil spring thereabout, said rod having a portionextending around the rear portion of the body and forwardly therealongto the rear portion of said hand hole, a rearwardly extendinginterengagement lug on said forwardly extending portion of the rod, saidbody having a socket opening forwardly into said hand hole adjace t tothe rear base portion of said handle and within which said lug isengageable to retain the rod in position.

4. in combination in a fastener driving machine, a body structure,handle on the upper forward portion of said body, a fastener supplymagazine extending from an opening at the rear of the lower portion ofthe body forwardly to open at the front portion of the body structure,means for pushing the fasteners forwardly in said magazine and including"a rod extending rearwardly around the *body structure and having "aportion'tp'rojecting forwardly past and adjacent to the'rear baseportion of said' handle, a coiled compression spring disposed about saidrod including said forwardly projecting portion, and longitudinallyextending protective'rib means on said body at the rear'base portion' ofthe handlealon'gside said rod portion and projecting laterallyther'ebeyond to protect the spring against undesirable engagement by thepalm portion of the hand of a user manipulating the machine by means ofsaid handle.

5. In a machine of the character described, means defining an elongatedfastener element chamber having an opening at one end and adapted todeliver at the opposite end to a fastener driving mechanism, a pusher insaid chamber, a generally U-shaped rod having a portion thereof in saidchamber associated operatively with said pusher and a second portiondisposed externally of said chamber, coiled compression spring meanssupported by both portions of said rod and acting to bias said pushernormally forwardly in said chamber, an interlock lug on said externalportion of the rod, and means interengageable releasably with saidinterlock lug and located on said first mentioned means for maintainingthe rod normally in operative position.

6. In a sash pin driving machine, a body structure, said body structurehaving a lengthwise extending pin-receiving magazine provided withopposite vertical wall portions between which sash pins are adapted tobe moved toward a driving station, and a nail-supporting rail structureof inverted L-shaped construction providing a rail flange extendinglengthwise within the magazine and overhanging one of the vertical wallstoward the other, with the edge of the rail flange spaced from saidother wall a distance slightly greater than the thickness of the neckportion of a pin having a sidewardly opening rail engaging head notch,said rail having an elongated vertically extending flange secured tosaid one wall and spaced from said other wall a distance substantiallygreater than the thickness of a pin so as to remain in positiveclearance relation to pins moved forwardly in the magazine.

7. In combination in a machine of the character described, a structureprovided with an elongated rearwardly opening fastening element magazineadapted for delivery of fastening elements to a driving station at thefront of the machine, a pusher for urging the fastening elementsforwardly in the magazine, a rod having a main portion rotatable aboutits axis and cooperatively related to the pusher and extendingrearwardly from the magazine, said rod having a portion extending aroundfrom the rear of the magazine and forwardly to a substantial extent andbeing swingable relative to said structure by rotational movement ofsaid main rod portion, biasing coil spring means on said rod portionsacting on said pusher to thrust the pusher forwardly, means forretaining the rod in operative position, said means including releasablyinterengageable components on, respectively, said structure and saidforwardly extending portion of the rod, and said components beinginterengageable by said swinging of said forwardly extending rod portionfrom a released position to said operative position.

8. In combination in a machine of the character described, a structureprovided with an elongated rearwardly opening fastening element magazineadapted for delivery of fastening elements to a driving station at thefront of the machine, a pusher for urging the fastening elementsforwardly in the magazine, a rod having a main portion rotatable aboutits axis and cooperatively related to the pusher and extendingrearwardly from the magazine, said rod having a portion extending aroundfrom the rear of the magazine and forwardly to a substantial extent andbeing swingable relative to said structure by rotational movement ofsaid main rod portion, biasing coil spring means on said rod portionsacting on said pusher to thrust the pusher forwardly, rod retainingmeans 10 releasably interengageableby swinging of said forwardlydirected portion'o'f the ro dfrom -a releasedposition to an=int'erengaged retained position, and guard means on saidstructure'cooperatively related to said'forwardly directed'rodportion'and the spring meansthere'on when'the'for wardly directedrod portion is in the retained position of the rod and from which guardmeans said forwardly iiirect'ed portion of the rod and the spring meansthereon are moved clear by swinging of said forwardly directed portionof the rod into said released position.

9. In combination in a machine of the character described, a structureprovided with an elongated rearwardly opening fastening element magazineadapted for delivery of fastening elements to a driving station at thefront of the machine, a pusher for urging the fastening elementsforwardly in the magazine, a rod having a main portion rotatable aboutits axis and cooperatively related to the pusher and extendingrearwardly from the magazine, said rod having a portion extending aroundfrom the rear of the magazine and forwardly to a substantial extent,biasing coil spring means on said rod portions acting on said pusher tothrust the pusher forwardly, and means for retaining the rod inoperative position comprising a forwardly opening socket fixedlypositioned with respect to said structure and a rearwardly directedinterlock lug on said forwardly extending portion of the rod releasablyinterengageable within said socket by movement of said forwardlyextending portion of the rod for effecting such interengagement.

10. In combination in a machine of the character described, a structureprovided with an elongated rearwardly opening fastening element magazineadapted for delivery of fastening elements to a driving station at thefront of the machine, a pusher for urging the fastening elementsforwardly in the magazine, a rod having a main portion cooperativelyrelated to the pusher and extending rearwardly from the magazine, saidrod having a portion extending around from the rear of the magazine andforwardly to a substantial extent, biasing coil spring means on said rodportions acting on said pusher to thrust the pusher forwardly, and meansfor retaining the rod in operative position comprising a forwardlyopening socket fixedly positioned with respect to said structure and arearwardly directed interlock lug on said forwardly extending portion ofthe rod releasably interengageable within said socket by movement ofsaid forwardly extending portion of the rod for effecting suchinterengagement, said lug being maintained in said socket by rearwardthrust imposed on said lug through said forwardly extending rod portionby said spring means.

11. In combination in a machine of the character described, a structureprovided with an elongated rearwardly opening fastening element magazineadapted for delivery of fastening elements to a driving station at thefront of the machine, a pusher for urging the fastening elementsforwardly in the magazine, a rod having a main portion cooperativelyrelated to the pusher and extending rearwardly from the magazine, saidrod having a portion extending around from the rear of the magazine andforwardly to a substantial extent, biasing coil spring means on said rodportions acting on said pusher to thrust the pusher forwardly, stopmeans engaged by said spring means adjacent to the forward extremityportion of said forwardly extending portion of the rod, and means forreleasably retaining the rod in operative position comprising separablemeans on said structure and on said forward extremity portion of saidforwardly extending rod portion forwardly of said stopmeans.

References Cited in the file of this patent UNITED STATES PATENTS1,717,479 Wakeman June 18, 1929 (Other references on following page)UNITED STATES PATENTS Ellacott Jan. 16, 1934 Polzer Dec. 4, 1934Obstfeld Feb. 5, 1935 Peterson Ian. 10, 1939 Cavanagh Oct. 17, 1939Obstfeld Mar. 4, 1941 James Apr. 8, 1941 Harred Sept. 5, 1944 AnstettJuly 15, 1947 Anstett Nov. 4, 1947 Rayburn Nov. 11, 1947 Allen July 12,1949 Vogel Nov. 13, 1951 Anstett Dec. 25, 1951

